diff --git a/logic/OneSixFTBInstance.cpp b/logic/OneSixFTBInstance.cpp
index ef9519875..8dfd30514 100644
--- a/logic/OneSixFTBInstance.cpp
+++ b/logic/OneSixFTBInstance.cpp
@@ -73,7 +73,6 @@ void OneSixFTBInstance::copy(const QDir &newDir)
 		for (auto library : libraryNames)
 		{
 			OneSixLibrary *lib = new OneSixLibrary(library);
-			lib->finalize();
 			const QString out = QDir::current().absoluteFilePath("libraries/" + lib->storagePath());
 			if (QFile::exists(out))
 			{
diff --git a/logic/forge/ForgeInstaller.cpp b/logic/forge/ForgeInstaller.cpp
index 74db2bfce..a230b0388 100644
--- a/logic/forge/ForgeInstaller.cpp
+++ b/logic/forge/ForgeInstaller.cpp
@@ -85,7 +85,6 @@ void ForgeInstaller::prepare(const QString &filename, const QString &universalUr
 
 	// where do we put the library? decode the mojang path
 	OneSixLibrary lib(libraryName);
-	lib.finalize();
 
 	auto cacheentry = MMC->metacache()->resolveEntry("libraries", lib.storagePath());
 	finalPath = "libraries/" + lib.storagePath();
@@ -140,11 +139,11 @@ bool ForgeInstaller::add(OneSixInstance *to)
 		// for each library in the version we are adding (except for the blacklisted)
 		for (auto lib : m_forge_json->libraries)
 		{
-			QString libName = lib->name();
+			QString libName = lib->artifactId();
 			QString rawName = lib->rawName();
 
 			// ignore lwjgl libraries.
-			if (g_VersionFilterData.lwjglWhitelist.contains(lib->fullname()))
+			if (g_VersionFilterData.lwjglWhitelist.contains(lib->artifactPrefix()))
 				continue;
 			// ignore other blacklisted (realms, authlib)
 			if (blacklist.contains(libName))
@@ -156,8 +155,7 @@ bool ForgeInstaller::add(OneSixInstance *to)
 			{
 				if (libName == "forge")
 				{
-					lib->m_name.setClassifier("universal");
-					lib->finalize();
+					lib->setClassifier("universal");
 				}
 				else if (libName == "minecraftforge")
 				{
@@ -165,8 +163,7 @@ bool ForgeInstaller::add(OneSixInstance *to)
 					// using insane form of the MC version...
 					QString longVersion = m_forge_version->mcver + "-" + m_forge_version->jobbuildver;
 					GradleSpecifier spec(forgeCoord.arg(longVersion));
-					lib->m_name = spec;
-					lib->finalize();
+					lib->setRawName(spec);
 				}
 			}
 			else
@@ -196,7 +193,7 @@ bool ForgeInstaller::add(OneSixInstance *to)
 			// find an entry that matches this one
 			for (auto tolib : to->getFullVersion()->vanillaLibraries)
 			{
-				if (tolib->name() != libName)
+				if (tolib->artifactId() != libName)
 					continue;
 				found = true;
 				if (tolib->toJson() == libObj)
@@ -215,7 +212,7 @@ bool ForgeInstaller::add(OneSixInstance *to)
 			{
 				// add lib
 				libObj.insert("insert", QString("prepend"));
-				if (lib->name() == "minecraftforge" || lib->name() == "forge")
+				if (lib->artifactId() == "minecraftforge" || lib->artifactId() == "forge")
 				{
 					libObj.insert("MMC-depend", QString("hard"));
 				}
diff --git a/logic/liteloader/LiteLoaderInstaller.cpp b/logic/liteloader/LiteLoaderInstaller.cpp
index 863c7fcb1..f1f9885a7 100644
--- a/logic/liteloader/LiteLoaderInstaller.cpp
+++ b/logic/liteloader/LiteLoaderInstaller.cpp
@@ -53,7 +53,6 @@ bool LiteLoaderInstaller::add(OneSixInstance *to)
 	{
 		rawLibrary->insertType = RawLibrary::Prepend;
 		OneSixLibrary lib(rawLibrary);
-		lib.finalize();
 		libraries.append(lib.toJson());
 	}
 
@@ -63,7 +62,6 @@ bool LiteLoaderInstaller::add(OneSixInstance *to)
 		liteloaderLib.setAbsoluteUrl(
 			QString("http://dl.liteloader.com/versions/com/mumfrey/liteloader/%1/%2")
 				.arg(m_version->mcVersion, m_version->file));
-		liteloaderLib.finalize();
 		QJsonObject llLibObj = liteloaderLib.toJson();
 		llLibObj.insert("insert", QString("prepend"));
 		llLibObj.insert("MMC-depend", QString("hard"));
diff --git a/logic/liteloader/LiteLoaderVersionList.cpp b/logic/liteloader/LiteLoaderVersionList.cpp
index af8509d6f..bf57867ad 100644
--- a/logic/liteloader/LiteLoaderVersionList.cpp
+++ b/logic/liteloader/LiteLoaderVersionList.cpp
@@ -212,7 +212,7 @@ void LLListLoadTask::listDownloaded()
 				{
 					auto lib = RawLibrary::fromJson(libobject, "versions.json");
 					// hack to make liteloader 1.7.10_00 work
-					if(lib->m_name == GradleSpecifier("org.ow2.asm:asm-all:5.0.3"))
+					if(lib->rawName() == GradleSpecifier("org.ow2.asm:asm-all:5.0.3"))
 					{
 						lib->m_base_url = "http://repo.maven.apache.org/maven2/";
 					}
diff --git a/logic/minecraft/GradleSpecifier.h b/logic/minecraft/GradleSpecifier.h
index 8a02e4d9e..411aed656 100644
--- a/logic/minecraft/GradleSpecifier.h
+++ b/logic/minecraft/GradleSpecifier.h
@@ -101,11 +101,11 @@ struct GradleSpecifier
 	{
 		return m_groupId + ":" + m_artifactId;
 	}
-	bool matchName(const GradleSpecifier & other)
+	bool matchName(const GradleSpecifier & other) const
 	{
 		return other.artifactId() == artifactId() && other.groupId() == groupId();
 	}
-	bool operator==(const GradleSpecifier & other)
+	bool operator==(const GradleSpecifier & other) const
 	{
 		if(m_groupId != other.m_groupId)
 			return false;
diff --git a/logic/minecraft/MinecraftVersionList.cpp b/logic/minecraft/MinecraftVersionList.cpp
index ee2285283..bde2170bf 100644
--- a/logic/minecraft/MinecraftVersionList.cpp
+++ b/logic/minecraft/MinecraftVersionList.cpp
@@ -452,7 +452,7 @@ void MCVListVersionUpdateTask::json_downloaded()
 
 	for (auto lib : file->overwriteLibs)
 	{
-		if (g_VersionFilterData.lwjglWhitelist.contains(lib->fullname()))
+		if (g_VersionFilterData.lwjglWhitelist.contains(lib->artifactPrefix()))
 		{
 			lwjglLibs.append(lib);
 		}
diff --git a/logic/minecraft/OneSixLibrary.cpp b/logic/minecraft/OneSixLibrary.cpp
index c562f3530..9b3f3b3e7 100644
--- a/logic/minecraft/OneSixLibrary.cpp
+++ b/logic/minecraft/OneSixLibrary.cpp
@@ -32,198 +32,15 @@ OneSixLibrary::OneSixLibrary(RawLibraryPtr base)
 	extract_excludes = base->extract_excludes;
 	m_native_classifiers = base->m_native_classifiers;
 	m_rules = base->m_rules;
-	finalize();
+	dependType = base->dependType;
+	// these only make sense for raw libraries. OneSix
+	/*
+	insertType = base->insertType;
+	insertData = base->insertData;
+	*/
 }
 
 OneSixLibraryPtr OneSixLibrary::fromRawLibrary(RawLibraryPtr lib)
 {
 	return OneSixLibraryPtr(new OneSixLibrary(lib));
 }
-
-void OneSixLibrary::finalize()
-{
-	QString relative;
-	
-	if (m_rules.empty())
-	{
-		m_is_active = true;
-	}
-	else
-	{
-		RuleAction result = Disallow;
-		for (auto rule : m_rules)
-		{
-			RuleAction temp = rule->apply(this);
-			if (temp != Defer)
-				result = temp;
-		}
-		m_is_active = (result == Allow);
-	}
-	if (isNative())
-	{
-		GradleSpecifier nativeSpec = m_name;
-		m_is_active = m_is_active && m_native_classifiers.contains(currentSystem);
-		m_decenttype = "Native";
-		if(m_native_classifiers.contains(currentSystem))
-		{
-			nativeSpec.setClassifier(m_native_classifiers[currentSystem]);
-		}
-		else
-		{
-			nativeSpec.setClassifier("INVALID");
-		}
-		relative = nativeSpec.toPath();
-	}
-	else
-	{
-		relative = m_name.toPath();
-		m_decenttype = "Java";
-	}
-
-	m_decentname = m_name.artifactId();
-	m_decentversion = minVersion = m_name.version();
-	m_storage_path = relative;
-	if(m_base_url.isEmpty())
-		m_download_url = QString("https://" + URLConstants::LIBRARY_BASE) + relative;
-	else
-		m_download_url = m_base_url + relative;
-}
-
-void OneSixLibrary::setName(const QString &name)
-{
-	m_name = name;
-}
-void OneSixLibrary::setBaseUrl(const QString &base_url)
-{
-	m_base_url = base_url;
-}
-void OneSixLibrary::addNative(OpSys os, const QString &suffix)
-{
-	m_native_classifiers[os] = suffix;
-}
-void OneSixLibrary::clearSuffixes()
-{
-	m_native_classifiers.clear();
-}
-void OneSixLibrary::setRules(QList<std::shared_ptr<Rule>> rules)
-{
-	m_rules = rules;
-}
-bool OneSixLibrary::isActive() const
-{
-	return m_is_active;
-}
-QString OneSixLibrary::downloadUrl() const
-{
-	if (m_absolute_url.size())
-		return m_absolute_url;
-	return m_download_url;
-}
-QString OneSixLibrary::storagePath() const
-{
-	return m_storage_path;
-}
-
-void OneSixLibrary::setAbsoluteUrl(const QString &absolute_url)
-{
-	m_absolute_url = absolute_url;
-}
-
-QString OneSixLibrary::absoluteUrl() const
-{
-	return m_absolute_url;
-}
-
-void OneSixLibrary::setHint(const QString &hint)
-{
-	m_hint = hint;
-}
-
-QString OneSixLibrary::hint() const
-{
-	return m_hint;
-}
-
-QStringList OneSixLibrary::files()
-{
-	QStringList retval;
-	QString storage = storagePath();
-	if (storage.contains("${arch}"))
-	{
-		QString cooked_storage = storage;
-		cooked_storage.replace("${arch}", "32");
-		retval.append(cooked_storage);
-		cooked_storage = storage;
-		cooked_storage.replace("${arch}", "64");
-		retval.append(cooked_storage);
-	}
-	else
-		retval.append(storage);
-	return retval;
-}
-
-bool OneSixLibrary::filesExist(const QDir &base)
-{
-	auto libFiles = files();
-	for(auto file: libFiles)
-	{
-		QFileInfo info(base, file);
-		QLOG_WARN() << info.absoluteFilePath() << "doesn't exist";
-		if (!info.exists())
-			return false;
-	}
-	return true;
-}
-
-bool OneSixLibrary::extractTo(QString target_dir)
-{
-	QString storage = storagePath();
-	if (storage.contains("${arch}"))
-	{
-		QString cooked_storage = storage;
-		cooked_storage.replace("${arch}", "32");
-		QString origin = PathCombine("libraries", cooked_storage);
-		QString target_dir_cooked = PathCombine(target_dir, "32");
-		if (!ensureFolderPathExists(target_dir_cooked))
-		{
-			QLOG_ERROR() << "Couldn't create folder " + target_dir_cooked;
-			return false;
-		}
-		if (JlCompress::extractWithExceptions(origin, target_dir_cooked, extract_excludes)
-				.isEmpty())
-		{
-			QLOG_ERROR() << "Couldn't extract " + origin;
-			return false;
-		}
-		cooked_storage = storage;
-		cooked_storage.replace("${arch}", "64");
-		origin = PathCombine("libraries", cooked_storage);
-		target_dir_cooked = PathCombine(target_dir, "64");
-		if (!ensureFolderPathExists(target_dir_cooked))
-		{
-			QLOG_ERROR() << "Couldn't create folder " + target_dir_cooked;
-			return false;
-		}
-		if (JlCompress::extractWithExceptions(origin, target_dir_cooked, extract_excludes)
-				.isEmpty())
-		{
-			QLOG_ERROR() << "Couldn't extract " + origin;
-			return false;
-		}
-	}
-	else
-	{
-		if (!ensureFolderPathExists(target_dir))
-		{
-			QLOG_ERROR() << "Couldn't create folder " + target_dir;
-			return false;
-		}
-		QString path = PathCombine("libraries", storage);
-		if (JlCompress::extractWithExceptions(path, target_dir, extract_excludes).isEmpty())
-		{
-			QLOG_ERROR() << "Couldn't extract " + path;
-			return false;
-		}
-	}
-	return true;
-}
diff --git a/logic/minecraft/OneSixLibrary.h b/logic/minecraft/OneSixLibrary.h
index 3d38985b6..2f60405af 100644
--- a/logic/minecraft/OneSixLibrary.h
+++ b/logic/minecraft/OneSixLibrary.h
@@ -26,38 +26,18 @@
 #include "logic/minecraft/OpSys.h"
 #include "logic/minecraft/RawLibrary.h"
 
-class Rule;
-
 class OneSixLibrary;
 typedef std::shared_ptr<OneSixLibrary> OneSixLibraryPtr;
 
+/**
+ * This is a leftover from a previous design.
+ * All it does is separate the 'Raw' libraries read from files from the 'OneSix' libraries
+ * used for actually doing things.
+ *
+ * DEPRECATED, but still useful to keep the data clean and separated by type.
+ */
 class OneSixLibrary : public RawLibrary
 {
-private:
-	/// a decent name fit for display
-	QString m_decentname;
-	/// a decent version fit for display
-	QString m_decentversion;
-	/// a decent type fit for display
-	QString m_decenttype;
-	/// where to store the lib locally
-	QString m_storage_path;
-	/// where to download the lib from
-	QString m_download_url;
-	/// is this lib actually active on the current OS?
-	bool m_is_active = false;
-
-public:
-	
-	QString minVersion;
-
-	enum DependType
-	{
-		Soft,
-		Hard
-	};
-	DependType dependType;
-
 public:
 	/// Constructor
 	OneSixLibrary(const QString &name, const DependType type = Soft)
@@ -69,62 +49,4 @@ public:
 	OneSixLibrary(RawLibraryPtr base);
 	static OneSixLibraryPtr fromRawLibrary(RawLibraryPtr lib);
 	
-	/// Returns the raw name field
-	QString rawName() const
-	{
-		return m_name;
-	}
-
-	/**
-	 * finalize the library, processing the input values into derived values and state
-	 *
-	 * This SHALL be called after all the values are parsed or after any further change.
-	 */
-	void finalize();
-
-	/// Set the library composite name
-	void setName(const QString &name);
-	/// get a decent-looking name
-	QString name() const
-	{
-		return m_decentname;
-	}
-	/// get a decent-looking version
-	QString version() const
-	{
-		return m_decentversion;
-	}
-	/// what kind of library is it? (for display)
-	QString type() const
-	{
-		return m_decenttype;
-	}
-	/// Set the url base for downloads
-	void setBaseUrl(const QString &base_url);
-
-	/// Attach a name suffix to the specified OS native
-	void addNative(OpSys os, const QString &suffix);
-	/// Clears all suffixes
-	void clearSuffixes();
-	/// Set the load rules
-	void setRules(QList<std::shared_ptr<Rule>> rules);
-
-	/// Returns true if the library should be loaded (or extracted, in case of natives)
-	bool isActive() const;
-	/// Get the URL to download the library from
-	QString downloadUrl() const;
-	/// Get the relative path where the library should be saved
-	QString storagePath() const;
-
-	/// set an absolute URL for the library. This is an MMC extension.
-	void setAbsoluteUrl(const QString &absolute_url);
-	QString absoluteUrl() const;
-
-	/// set a hint about how to treat the library. This is an MMC extension.
-	void setHint(const QString &hint);
-	QString hint() const;
-
-	bool extractTo(QString target_dir);
-	bool filesExist(const QDir &base);
-	QStringList files();
 };
diff --git a/logic/minecraft/OneSixRule.h b/logic/minecraft/OneSixRule.h
index a18093b0c..33f7ff933 100644
--- a/logic/minecraft/OneSixRule.h
+++ b/logic/minecraft/OneSixRule.h
@@ -21,7 +21,7 @@
 #include <memory>
 #include "OpSys.h"
 
-class OneSixLibrary;
+class RawLibrary;
 class Rule;
 
 enum RuleAction
@@ -37,7 +37,7 @@ class Rule
 {
 protected:
 	RuleAction m_result;
-	virtual bool applies(OneSixLibrary *parent) = 0;
+	virtual bool applies(const RawLibrary *parent) = 0;
 
 public:
 	Rule(RuleAction result) : m_result(result)
@@ -45,14 +45,13 @@ public:
 	}
 	virtual ~Rule() {};
 	virtual QJsonObject toJson() = 0;
-	RuleAction apply(OneSixLibrary *parent)
+	RuleAction apply(const RawLibrary *parent)
 	{
 		if (applies(parent))
 			return m_result;
 		else
 			return Defer;
 	}
-	;
 };
 
 class OsRule : public Rule
@@ -64,7 +63,7 @@ private:
 	QString m_version_regexp;
 
 protected:
-	virtual bool applies(OneSixLibrary *)
+	virtual bool applies(const RawLibrary *)
 	{
 		return (m_system == currentSystem);
 	}
@@ -85,7 +84,7 @@ public:
 class ImplicitRule : public Rule
 {
 protected:
-	virtual bool applies(OneSixLibrary *)
+	virtual bool applies(const RawLibrary *)
 	{
 		return true;
 	}
diff --git a/logic/minecraft/RawLibrary.cpp b/logic/minecraft/RawLibrary.cpp
index 76bd72607..c3df6e0c0 100644
--- a/logic/minecraft/RawLibrary.cpp
+++ b/logic/minecraft/RawLibrary.cpp
@@ -72,44 +72,54 @@ RawLibraryPtr RawLibrary::fromJsonPlus(const QJsonObject &libObj, const QString
 	if (libObj.contains("insert"))
 	{
 		QJsonValue insertVal = ensureExists(libObj.value("insert"), "library insert rule");
-		QString insertString;
+		if (insertVal.isString())
 		{
-			if (insertVal.isString())
+			// it's just a simple string rule. OK.
+			QString insertString = insertVal.toString();
+			if (insertString == "apply")
 			{
-				insertString = insertVal.toString();
+				lib->insertType = RawLibrary::Apply;
 			}
-			else if (insertVal.isObject())
+			else if (insertString == "prepend")
 			{
-				QJsonObject insertObj = insertVal.toObject();
-				if (insertObj.isEmpty())
-				{
-					throw JSONValidationError("One library has an empty insert object in " +
-											  filename);
-				}
-				insertString = insertObj.keys().first();
-				lib->insertData = insertObj.value(insertString).toString();
+				lib->insertType = RawLibrary::Prepend;
+			}
+			else if (insertString == "append")
+			{
+				lib->insertType = RawLibrary::Append;
+			}
+			else if (insertString == "replace")
+			{
+				lib->insertType = RawLibrary::Replace;
+			}
+			else
+			{
+				throw JSONValidationError("A '+' library in " + filename +
+										" contains an invalid insert type");
 			}
 		}
-		if (insertString == "apply")
+		else if (insertVal.isObject())
 		{
-			lib->insertType = RawLibrary::Apply;
-		}
-		else if (insertString == "prepend")
-		{
-			lib->insertType = RawLibrary::Prepend;
-		}
-		else if (insertString == "append")
-		{
-			lib->insertType = RawLibrary::Append;
-		}
-		else if (insertString == "replace")
-		{
-			lib->insertType = RawLibrary::Replace;
+			// it's a more complex rule, specifying what should be:
+			//   * replaced (for now only this)
+			// this was never used, AFAIK. tread carefully.
+			QJsonObject insertObj = insertVal.toObject();
+			if (insertObj.isEmpty())
+			{
+				throw JSONValidationError("Empty compound insert rule in " + filename);
+			}
+			QString insertString = insertObj.keys().first();
+			// really, only replace makes sense in combination with 
+			if(insertString != "replace")
+			{
+				throw JSONValidationError("Compound insert rule is not 'replace' in " + filename);
+			}
+			lib->insertData = insertObj.value(insertString).toString();
 		}
 		else
 		{
 			throw JSONValidationError("A '+' library in " + filename +
-									  " contains an invalid insert type");
+						" contains an unknown/invalid insert rule");
 		}
 	}
 	if (libObj.contains("MMC-depend"))
@@ -132,12 +142,7 @@ RawLibraryPtr RawLibrary::fromJsonPlus(const QJsonObject &libObj, const QString
 	return lib;
 }
 
-bool RawLibrary::isNative() const
-{
-	return m_native_classifiers.size() != 0;
-}
-
-QJsonObject RawLibrary::toJson()
+QJsonObject RawLibrary::toJson() const
 {
 	QJsonObject libRoot;
 	libRoot.insert("name", (QString)m_name);
@@ -186,7 +191,91 @@ QJsonObject RawLibrary::toJson()
 	return libRoot;
 }
 
-QString RawLibrary::fullname()
+QStringList RawLibrary::files() const
 {
-	return m_name.artifactPrefix();
+	QStringList retval;
+	QString storage = storagePath();
+	if (storage.contains("${arch}"))
+	{
+		QString cooked_storage = storage;
+		cooked_storage.replace("${arch}", "32");
+		retval.append(cooked_storage);
+		cooked_storage = storage;
+		cooked_storage.replace("${arch}", "64");
+		retval.append(cooked_storage);
+	}
+	else
+		retval.append(storage);
+	return retval;
+}
+
+bool RawLibrary::filesExist(const QDir &base) const
+{
+	auto libFiles = files();
+	for(auto file: libFiles)
+	{
+		QFileInfo info(base, file);
+		QLOG_WARN() << info.absoluteFilePath() << "doesn't exist";
+		if (!info.exists())
+			return false;
+	}
+	return true;
+}
+QString RawLibrary::downloadUrl() const
+{
+	if (m_absolute_url.size())
+		return m_absolute_url;
+
+	if (m_base_url.isEmpty())
+	{
+		return QString("https://" + URLConstants::LIBRARY_BASE) + storagePath();
+	}
+
+	return m_base_url + storagePath();
+}
+
+bool RawLibrary::isActive() const
+{
+	bool result = true;
+	if (m_rules.empty())
+	{
+		result = true;
+	}
+	else
+	{
+		RuleAction ruleResult = Disallow;
+		for (auto rule : m_rules)
+		{
+			RuleAction temp = rule->apply(this);
+			if (temp != Defer)
+				ruleResult = temp;
+		}
+		result = result && (ruleResult == Allow);
+	}
+	if (isNative())
+	{
+		result = result && m_native_classifiers.contains(currentSystem);
+	}
+	return result;
+}
+
+QString RawLibrary::storagePath() const
+{
+	// non-native? use only the gradle specifier
+	if (!isNative())
+	{
+		return m_name.toPath();
+	}
+
+	// otherwise native, override classifiers. Mojang HACK!
+	GradleSpecifier nativeSpec = m_name;
+	if(m_native_classifiers.contains(currentSystem))
+	{
+		nativeSpec.setClassifier(m_native_classifiers[currentSystem]);
+	}
+	else
+	{
+		nativeSpec.setClassifier("INVALID");
+	}
+	return nativeSpec.toPath();
 }
diff --git a/logic/minecraft/RawLibrary.h b/logic/minecraft/RawLibrary.h
index 6e8f7f10c..6263f99a5 100644
--- a/logic/minecraft/RawLibrary.h
+++ b/logic/minecraft/RawLibrary.h
@@ -4,6 +4,7 @@
 #include <QList>
 #include <QStringList>
 #include <QMap>
+#include <QDir>
 #include <memory>
 
 #include "logic/minecraft/OneSixRule.h"
@@ -16,36 +17,141 @@ typedef std::shared_ptr<RawLibrary> RawLibraryPtr;
 
 class RawLibrary
 {
+	friend class OneSixLibrary;
 public: /* methods */
 	/// read and create a basic library
 	static RawLibraryPtr fromJson(const QJsonObject &libObj, const QString &filename);
+
 	/// read and create a MultiMC '+' library. Those have some extra fields.
 	static RawLibraryPtr fromJsonPlus(const QJsonObject &libObj, const QString &filename);
-	QJsonObject toJson();
+
+	/// Convert the library back to an JSON object
+	QJsonObject toJson() const;
+
+	/// Returns the raw name field
+	const GradleSpecifier & rawName() const
+	{
+		return m_name;
+	}
 	
-	QString fullname();
+	void setRawName(const GradleSpecifier & spec)
+	{
+		m_name = spec;
+	}
+
+	void setClassifier(const QString & spec)
+	{
+		m_name.setClassifier(spec);
+	}
 	
-public: /* data */
+	/// returns the full group and artifact prefix
+	QString artifactPrefix() const
+	{
+		return m_name.artifactPrefix();
+	}
+
+	/// get the artifact ID
+	QString artifactId() const
+	{
+		return m_name.artifactId();
+	}
+
+	/// get the artifact version
+	QString version() const
+	{
+		return m_name.version();
+	}
+
+	/// Returns true if the library is native
+	bool isNative() const
+	{
+		return m_native_classifiers.size() != 0;
+	}
+
+	/// Set the url base for downloads
+	void setBaseUrl(const QString &base_url)
+	{
+		m_base_url = base_url;
+	}
+
+	/// List of files this library describes. Required because of platform-specificness of native libs
+	QStringList files() const;
+
+	/// List Shortcut for checking if all the above files exist
+	bool filesExist(const QDir &base) const;
+
+	void setAbsoluteUrl(const QString &absolute_url)
+	{
+		m_absolute_url = absolute_url;
+	}
+
+	QString absoluteUrl() const
+	{
+		return m_absolute_url;
+	}
+
+	void setHint(const QString &hint)
+	{
+		m_hint = hint;
+	}
+
+	QString hint() const
+	{
+		return m_hint;
+	}
+
+	/// Set the load rules
+	void setRules(QList<std::shared_ptr<Rule>> rules)
+	{
+		m_rules = rules;
+	}
+
+	/// Returns true if the library should be loaded (or extracted, in case of natives)
+	bool isActive() const;
+
+	/// Get the URL to download the library from
+	QString downloadUrl() const;
+
+	/// Get the relative path where the library should be saved
+	QString storagePath() const;
+
+
+protected: /* data */
+	/// the basic gradle dependency specifier.
 	GradleSpecifier m_name;
+	/// where to store the lib locally
+	QString m_storage_path;
+	/// is this lib actually active on the current OS?
+	bool m_is_active = false;
+
+
+public: /* data */
+	// TODO: make all of these protected, clean up semantics of implicit vs. explicit values.
+	/// URL where the file can be downloaded
 	QString m_base_url;
 
+	/// DEPRECATED: absolute URL. takes precedence the normal download URL, if defined
+	QString m_absolute_url;
+
 	/// type hint - modifies how the library is treated
 	QString m_hint;
-	/// DEPRECATED: absolute URL. takes precedence over m_download_path, if defined
-	QString m_absolute_url;
 
+	/// true if the library had an extract/excludes section (even empty)
 	bool applyExcludes = false;
+
+	/// a list of files that shouldn't be extracted from the library
 	QStringList extract_excludes;
 
-	/// Returns true if the library is native
-	bool isNative() const;
 	/// native suffixes per OS
 	QMap<OpSys, QString> m_native_classifiers;
 
+	/// true if the library had a rules section (even empty)
 	bool applyRules = false;
+
+	/// rules associated with the library
 	QList<std::shared_ptr<Rule>> m_rules;
 
-	// used for '+' libraries
+	/// used for '+' libraries, determines how to add them
 	enum InsertType
 	{
 		Apply,
@@ -55,10 +161,10 @@ public: /* data */
 	} insertType = Append;
 	QString insertData;
 	
-	// soft or hard dependency? hard means 'needs equal', soft means 'needs equal or newer'
+	/// determines how can libraries be applied. conflicting dependencies cause errors.
 	enum DependType
 	{
-		Soft,
-		Hard
+		Soft, //! needs equal or newer version
+		Hard  //! needs equal version (different versions mean version conflict)
 	} dependType = Soft;
 };
diff --git a/logic/minecraft/VersionFile.cpp b/logic/minecraft/VersionFile.cpp
index 600c71ae2..778c5a273 100644
--- a/logic/minecraft/VersionFile.cpp
+++ b/logic/minecraft/VersionFile.cpp
@@ -23,7 +23,7 @@ int findLibraryByName(QList<OneSixLibraryPtr> haystack, const GradleSpecifier &n
 	for (int i = 0; i < haystack.size(); ++i)
 	{
 		
-		if(haystack.at(i)->m_name.matchName(needle))
+		if(haystack.at(i)->rawName().matchName(needle))
 		{
 			// only one is allowed.
 			if (retval != -1)
@@ -375,119 +375,108 @@ void VersionFile::applyTo(InstanceVersion *version)
 		}
 		version->libraries = libs;
 	}
-	for (auto lib : addLibs)
+	for (auto addedLibrary : addLibs)
 	{
-		switch (lib->insertType)
+		switch (addedLibrary->insertType)
 		{
 		case RawLibrary::Apply:
 		{
 			// QLOG_INFO() << "Applying lib " << lib->name;
-			int index = findLibraryByName(version->libraries, lib->m_name);
+			int index = findLibraryByName(version->libraries, addedLibrary->rawName());
 			if (index >= 0)
 			{
-				auto library = version->libraries[index];
-				if (!lib->m_base_url.isNull())
+				auto existingLibrary = version->libraries[index];
+				if (!addedLibrary->m_base_url.isNull())
 				{
-					library->setBaseUrl(lib->m_base_url);
+					existingLibrary->setBaseUrl(addedLibrary->m_base_url);
 				}
-				if (!lib->m_hint.isNull())
+				if (!addedLibrary->m_hint.isNull())
 				{
-					library->setHint(lib->m_hint);
+					existingLibrary->setHint(addedLibrary->m_hint);
 				}
-				if (!lib->m_absolute_url.isNull())
+				if (!addedLibrary->m_absolute_url.isNull())
 				{
-					library->setAbsoluteUrl(lib->m_absolute_url);
+					existingLibrary->setAbsoluteUrl(addedLibrary->m_absolute_url);
 				}
-				if (lib->applyExcludes)
+				if (addedLibrary->applyExcludes)
 				{
-					library->extract_excludes = lib->extract_excludes;
+					existingLibrary->extract_excludes = addedLibrary->extract_excludes;
 				}
-				if (lib->isNative())
+				if (addedLibrary->isNative())
 				{
-					// library->clearSuffixes();
-					library->m_native_classifiers = lib->m_native_classifiers;
-					/*
-					for (auto native : lib->natives)
-					{
-						library->addNative(native.first, native.second);
-					}
-					*/
+					existingLibrary->m_native_classifiers = addedLibrary->m_native_classifiers;
 				}
-				if (lib->applyRules)
+				if (addedLibrary->applyRules)
 				{
-					library->setRules(lib->m_rules);
+					existingLibrary->setRules(addedLibrary->m_rules);
 				}
-				library->finalize();
 			}
 			else
 			{
-				QLOG_WARN() << "Couldn't find" << lib->m_name << "(skipping)";
+				QLOG_WARN() << "Couldn't find" << addedLibrary->rawName() << "(skipping)";
 			}
 			break;
 		}
 		case RawLibrary::Append:
 		case RawLibrary::Prepend:
 		{
-			// QLOG_INFO() << "Adding lib " << lib->name;
-			const int index = findLibraryByName(version->libraries, lib->m_name);
+			// find the library by name.
+			const int index = findLibraryByName(version->libraries, addedLibrary->rawName());
+			// library not found? just add it.
 			if (index < 0)
 			{
-				if (lib->insertType == RawLibrary::Append)
+				if (addedLibrary->insertType == RawLibrary::Append)
 				{
-					version->libraries.append(OneSixLibrary::fromRawLibrary(lib));
+					version->libraries.append(OneSixLibrary::fromRawLibrary(addedLibrary));
 				}
 				else
 				{
-					version->libraries.prepend(OneSixLibrary::fromRawLibrary(lib));
+					version->libraries.prepend(OneSixLibrary::fromRawLibrary(addedLibrary));
+				}
+				break;
+			}
+
+			// otherwise apply differences, if allowed
+			auto existingLibrary = version->libraries.at(index);
+			const Util::Version addedVersion = addedLibrary->version();
+			const Util::Version existingVersion = existingLibrary->version();
+			// if the existing version is a hard dependency we can either use it or
+			// fail, but we can't change it
+			if (existingLibrary->dependType == OneSixLibrary::Hard)
+			{
+				// we need a higher version, or we're hard to and the versions aren't
+				// equal
+				if (addedVersion > existingVersion ||
+					(addedLibrary->dependType == RawLibrary::Hard && addedVersion != existingVersion))
+				{
+					throw VersionBuildError(QObject::tr(
+						"Error resolving library dependencies between %1 and %2 in %3.")
+												.arg(existingLibrary->rawName(),
+													 addedLibrary->rawName(), filename));
+				}
+				else
+				{
+					// the library is already existing, so we don't have to do anything
 				}
 			}
-			else
+			else if (existingLibrary->dependType == OneSixLibrary::Soft)
 			{
-				auto otherLib = version->libraries.at(index);
-				const Util::Version ourVersion = lib->m_name.version();
-				const Util::Version otherVersion = otherLib->m_name.version();
-				// if the existing version is a hard dependency we can either use it or
-				// fail, but we can't change it
-				if (otherLib->dependType == OneSixLibrary::Hard)
+				// if we are higher it means we should update
+				if (addedVersion > existingVersion)
 				{
-					// we need a higher version, or we're hard to and the versions aren't
-					// equal
-					if (ourVersion > otherVersion ||
-						(lib->dependType == RawLibrary::Hard && ourVersion != otherVersion))
-					{
-						throw VersionBuildError(
-							QObject::tr(
-								"Error resolving library dependencies between %1 and %2 in %3.")
-								.arg(otherLib->rawName(), lib->m_name, filename));
-					}
-					else
-					{
-						// the library is already existing, so we don't have to do anything
-					}
+					auto library = OneSixLibrary::fromRawLibrary(addedLibrary);
+					version->libraries.replace(index, library);
 				}
-				else if (otherLib->dependType == OneSixLibrary::Soft)
+				else
 				{
-					// if we are higher it means we should update
-					if (ourVersion > otherVersion)
+					// our version is smaller than the existing version, but we require
+					// it: fail
+					if (addedLibrary->dependType == RawLibrary::Hard)
 					{
-						auto library = OneSixLibrary::fromRawLibrary(lib);
-						if (Util::Version(otherLib->minVersion) < ourVersion)
-						{
-							library->minVersion = ourVersion.toString();
-						}
-						version->libraries.replace(index, library);
-					}
-					else
-					{
-						// our version is smaller than the existing version, but we require
-						// it: fail
-						if (lib->dependType == RawLibrary::Hard)
-						{
-							throw VersionBuildError(QObject::tr(
-								"Error resolving library dependencies between %1 and %2 in %3.")
-														.arg(otherLib->rawName(), lib->m_name,
-															 filename));
-						}
+						throw VersionBuildError(QObject::tr(
+							"Error resolving library dependencies between %1 and %2 in %3.")
+													.arg(existingLibrary->rawName(),
+														 addedLibrary->rawName(), filename));
 					}
 				}
 			}
@@ -496,19 +485,19 @@ void VersionFile::applyTo(InstanceVersion *version)
 		case RawLibrary::Replace:
 		{
 			GradleSpecifier toReplace;
-			if (lib->insertData.isEmpty())
+			if (addedLibrary->insertData.isEmpty())
 			{
-				toReplace = lib->m_name;
+				toReplace = addedLibrary->rawName();
 			}
 			else
 			{
-				toReplace = lib->insertData;
+				toReplace = addedLibrary->insertData;
 			}
 			// QLOG_INFO() << "Replacing lib " << toReplace << " with " << lib->name;
 			int index = findLibraryByName(version->libraries, toReplace);
 			if (index >= 0)
 			{
-				version->libraries.replace(index, OneSixLibrary::fromRawLibrary(lib));
+				version->libraries.replace(index, OneSixLibrary::fromRawLibrary(addedLibrary));
 			}
 			else
 			{