The European Commission opened two, formal antitrust investigations against Motorola Mobility, following complaints from Apple and Microsoft.

In a statement, the EC said that it would “assess whether Motorola has abusively, and in contravention of commitments it gave to the standards setting organisations, used certain of its standard essential patents to distort competition,” in breach of EU antitrust rules.

In particular, the regulator will investigate whether by seeking and enforcing injunctions against “products such as iPhone, iPad Windows and Xbox,” on the basis of patents declared essential to standards, Motorola has failed to meet commitments it made with regard to licensing.

Apple filed a complaint with the EC earlier this year, arguing that Motorola was failing to licence patents on fair, reasonable and non-discriminatory terms. Microsoft followed suit shortly afterward.

The investigations follow a similar action from the EC involving Samsung, which likewise was accused of failing to meet commitments related to licensing standards-essential patents.

Earlier this year, the EC gave its clearance to the acquisition of Motorola Mobility by Google, noting that it would “continue to keep a close eye on the behaviour of all market players in the sector, particularly the increasingly strategic use of patents.” This deal has yet to close, due to an extended probe by the Chinese authorities.