Endless legal battles over who owns patents ?

From within Biofuel breakthrough turns virtually any plant into hydrogen :

Of course, there are potential downsides to Zhang’s enzyme cocktail, namely in the costs of production on a large scale, questions about disposal of the enzyme goo and remaining carbon, and the likelihood of endless legal battles over who owns patents on which enzymes or combinations thereof. Nevertheless, if the world is to move forward into a renewable energy future, this is still a pretty big step.

Also, in the article:

The new process, described by a study in the April issue of the scientific journal Angewandte Chemie, uses a cocktail of 13 enzymes to strip plant matter of xylose, a sugar that exists in plant cells. The resulting hydrogen is of an such a “high purity” that researchers said they were able to approach 100 percent extraction, opening up a potential market for a much cheaper source of hydrogen than anything available today.

“The potential for profit and environmental benefits are why so many automobile, oil, and energy companies are working on hydrogen fuel cell vehicles as the transportation of the future,” study author and Virginia Tech assistant professor Y.H. Percival Zhang said in an advisory. “Many people believe we will enter the hydrogen economy soon, with a market capacity of at least $1 trillion in the United States alone.”