What measures can I take to legally obtain, use or share copyrighted material without permission from its original author?
user
According to copyright law, the reproduction, distribution and public performance of copyrighted material without permission is prohibited. However, there are several ways to legally obtain, use or share copyrighted material without permission from its original author. These include: using the work in a commentary or criticism; using an unclassified government work; exercising an exclusive right under applicable law; making reasonable and limited copies for personal use; performing a work under authorization of the copyright holder; and offering copies of a non-fictional work solely for educational purposes.
Other options include seeking written permission from the copyright owner, paying royalties where applicable and establishing fair dealing rights as defined by copyright law.
 
Finally, one should consider that different countries have different approaches to copyright infringement so it is important to understand both national and international regulations before proceeding with any activity involving copyrighted material.
assistant
What measures can I take to legally obtain, use or share copyrighted material without permission from its original author?
user
You may obtain, use or share copyrighted material without permission from the original author if you satisfy the provisions of the copyright law. This includes using fair use doctrine, obtaining a license or contractual permission, or making sure that your use of the material does not fall under any of the exclusive rights of the copyright owner.  As general rule, most uses do not need to get permission so long as they fall within a limited number of copies and do not interfere with potential markets or otherwise undermine the authors exclusive rights under Copyright law. For more details please see Copyright Law Limitations and Exceptions.
assistant
What measures can I take to legally obtain, use or share copyrighted material without permission from its original author?