BERLIN--The German government has approved the sale of encrypted phone-maker Secusmart GmbH to Canada's BlackBerry Ltd., saying it has no national security concerns.

The deal has been weighed down by ongoing trans-Atlantic tensions relating to spying, after revelations in the summer of 2013 that the U.S. government had tapped German chancellor Angela Merkel's phone.

While BlackBerry is a Canadian company, the Canadian government has an intelligence agreement with the U.S. that raised concerns in Germany.

The Düsseldorf-based Secusmart sells encrypted landline and mobile phones to the German government for use at home and abroad. After Secusmart ran into financial trouble, BlackBerry showed interest in an acquisition, and the two companies agreed on a deal back in July.

After the deal was announced, several German government ministries said they would evaluate the terms in light of national security and competition concerns. On Friday, a spokesman for the Interior Ministry in Berlin said that a service contract between the German government and BlackBerry takes into account German security interests.

A person familiar with the matter said BlackBerry was forced to reveal its source code to the Federal Office for Information Security, the government authority responsible for government computer security in Germany.

The Canadian phone maker and software company also issued a public pledge not to spy on German soil, a "no-spy" agreement that has become common for German government contracts.

A BlackBerry executive said the deal was never in trouble and the investigation was a normal part of doing business with the German government.

Write to Stefan Lange at stefan.lange@wsj.com and Chase Gummer at Chase.Gummer@wsj.com

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