Background
DivX, LLC holds patents directed to media streaming technology — specifically, methods for storing video content as separate streams optimized for different device capabilities and automatically generating index files that describe the location and content of those streams. Netflix, the streaming giant, challenged these patents through inter partes review (IPR) before the Patent Trial and Appeal Board (PTAB). Netflix sought to have the patents invalidated as obvious or anticipated based on prior art in the streaming technology field.
PTAB issued a final written decision finding the challenged patent claims patentable. Netflix appealed to the Federal Circuit, but rather than challenging PTAB’s substantive analysis of the prior art, Netflix made a purely procedural argument: it contended that PTAB had failed to address arguments that Netflix had raised in its original IPR petitions. The Federal Circuit, in a split 2-1 decision, rejected this challenge and affirmed PTAB.
The Court’s Holding
The majority held that Netflix’s arguments on appeal were forfeited because they had not been adequately presented before PTAB in the IPR petitions. The Federal Circuit applied a demanding standard for what it means to “raise” an argument in an IPR petition: it is the petitioner’s burden to clearly identify when alternative arguments are being presented and to sufficiently expound on each argument so that the Board can meaningfully consider it. Vague or underdeveloped allusions to a theory — without the explanation and evidence needed for the Board to actually evaluate it — do not constitute a raised argument that the Board was obligated to address.
Because Netflix’s petitions did not clearly present the arguments it sought to press on appeal, the Federal Circuit concluded that PTAB had not failed to address those arguments at all — rather, the arguments simply were not before the Board in the first place. The court therefore had no basis to remand for the Board to consider arguments that Netflix had never properly raised.
Judge Dyk dissented, taking the view that Netflix’s petitions had adequately raised the disputed arguments and that PTAB had improperly ignored them. In his view, the majority’s standard for what constitutes an adequately presented argument was too demanding given the practical realities of IPR petition drafting, and the Board’s failure to engage with legitimately raised arguments was an error requiring remand.
Key Takeaways
- IPR petitioners bear the burden of clearly and fully presenting each argument in the petition; underdeveloped or vague arguments will be treated as not raised, leaving them forfeited on appeal.
- When a petitioner wishes to advance alternative invalidity arguments (e.g., primary and secondary obviousness grounds), each alternative must be explicitly identified and adequately developed in the petition.
- Appellants cannot successfully argue on appeal that PTAB failed to address an argument the petitioner never properly raised below — the Federal Circuit will not remand for PTAB to consider arguments the Board was never given a fair opportunity to evaluate.
- The split decision reflects ongoing tension over how strictly to apply forfeiture rules in PTAB proceedings, where petitions are subject to word limits that can make it challenging to develop every argument fully.
Why It Matters
This decision reinforces a critical lesson for IPR petitioners: the petition is the foundation of the entire proceeding, and everything that matters must be clearly planted there. Unlike district court litigation — where pleadings can be amended and theories often develop through discovery — an IPR petitioner’s ability to raise new or expanded arguments is sharply constrained after the petition is filed. The Federal Circuit’s holding means that petitioners who draft petitions with implicit, abbreviated, or incompletely developed arguments risk losing those arguments permanently, without ever receiving a substantive ruling on the merits.
The case is particularly significant for technology companies like Netflix that frequently use IPR as a tool to challenge patents asserted against their core business operations. Streaming and digital media patents have been heavily litigated, and IPR proceedings are often the most efficient vehicle for challenging them. But this decision underscores that IPR efficiency comes with a high cost for error: unlike district court, there are few second chances to fix a deficient record. Patent counsel drafting IPR petitions should treat every alternative argument as if it will be fully contested, developing each ground with sufficient specificity and supporting evidence — even within the petition’s word limits — to ensure it is preserved for appeal.