they are not bootleg. you better go do a bit of reading about creative copyright etc.
even though the images we are using are all copyrighted by the source, our turning them into a piece of creative media means we can exert copyright over what 'we' have created as long as we do not charge money for them otherwise we ourselves would then be in breach of copyright.
we in no way relinquish our own rights regarding what we have created at any time. hence, courtesy to ask for permissions from those whose work you will be using.