studynotes has a DMCA Policy in place to address copyright concerns. They assert that their website does not host any copyrighted material and that all products presented are available under the GNU General Public License. ​studynotes

If you believe that copyrighted material has been posted on studynotes or linked through their search engine, they have outlined a procedure to report alleged infringements in compliance with the Digital Millennium Copyright Act (DMCA). This includes providing evidence of authorization to act on behalf of the copyright owner, sufficient contact information, detailed identification of the copyrighted work, and a statement of good-faith belief that the use is unauthorized. ​studynotes

For detailed instructions on reporting copyright infringement, please refer to their DMCA Policy page.