generate questions: In the past, many organizations have claimed ownership of patents related to MP3 decoding or encoding. These claims led to a number of legal threats and actions from a variety of sources. As a result, uncertainty about which patents must be licensed in order to create MP3 products without committing patent infringement in countries that allow software patents was a common feature of the early stages of adoption of the technology.
What has many organizations claiming ownership of patents related to aspects of MP3 led to? {sep_token} Legal threats and confusion made it difficult to ensure what about patents regarding MP3 products? {sep_token} What was the danger of not correctly patenting products? {sep_token} At what stage of the technology were these problems prevalent? {sep_token}