Intellectual Property Code
Section 102. Licensee's Exemption from Liability. - Any person who works a patented product, substance and/or process under a license granted under this Chapter, shall be free from any liability for infringement: Provided however, That in the case of voluntary licensing, no collusion with the licensor is proven. This is without prejudice to the right of the rightful owner of the patent to recover from the licensor whatever he may have received as royalties under the license. (Sec. 35-E, R.A. No. 165a)