(Telecompaper) InterDigital has announced that its patent holding subsidiaries have entered into an agreement which extends the term of their worldwide, non-exclusive royalty-bearing patent licence agreement with Research In Motion (RIM). In addition to extending the patent licence agreement for a multi-year period consistent with InterDigital's licensing programme, the parties agreed to amend the patent licence to add coverage for 4G products, including LTE and LTE-Advanced products.