choosing authentication to google api in batch application

In reviewing my options for authenticating against the Google Data API (using the Picasa Web Albums), I'm provided the options noted here: http://code.google.com/apis/accounts/docs/GettingStarted.html

However, the application I'm working with is a batch application (bulk upload of photos), and these all seem geared toward applications with user-interactions (i.e. it seems they're restricted to obtaining a user's password via a redirect to a web page).

As well, after multiple uploads the server API prompts for a captcha confirmation, and blocks further upload until that is obtained.

Am I simply running up against imposed restrictions to protect their bandwidth?

Update

Here's the code that is do开发者_如何学Pythoning the insert; a new instance of com.google.gdata.client.photos.PicasawebService is created for each worker thread. The pool of worker threads is constrained to about 10-20 threads, and each thread is assigned to upload a single image (or create an album):

    PicasawebService service = new PicasawebService(Constants.APPLICATION_AGENT);
    try {
        service.setUserCredentials(
            credentials.username(),
            credentials.password()
        );
    } catch (com.google.gdata.util.AuthenticationException e) {
        throw new AuthenticationException(e);
    }

Have you tried this? http://code.google.com/apis/gdata/docs/batch.html#Batch_API